Hello and welcome back fellow oldie
If you want to join an active Blockland community, you should consider joining the
Content Creators server (formerly known as (but still majorly functions as) Blockland Content Creators)
You don't have to be a content creator to join, you can just chill, talk, post screenshots, discuss and get help with non-Blockland/video game related stuff, etc
There are a lot of older users there (mostly 2010 era users, but also some 2000 era here and there), but a lot of OGs who used to inhabit these forums just kinda went elsewhere, or just abandoned Blockland altogether